first

app/add.py

@@ -0,0 +1,48 @@
+from datetime import datetime, date, time
+from dateutil import parser
+from typing import List, Union, Tuple
+
+from types_ import Minutes
+
+
+def subtract_times(first: time, second: time) -> Minutes:
+    return int(
+        (
+            datetime.combine(datetime(1, 1, 1, 0, 0, 0), second)
+            - datetime.combine(date.today(), first)
+        ).seconds
+        / 60
+    )
+
+
+def add_up_timesheet(timesheet_string: str) -> Minutes:
+    total_minutes = 0
+
+    for line in timesheet_string.split("\n"):
+        time_range_strings = find_time_ranges(line)
+        if time_range_strings:
+            for time_range_string in time_range_strings:
+                start_string, end_string = split_time_range_string(time_range_string)
+                start, end = map(parse_time, [start_string, end_string])
+                total_minutes += subtract_times(start, end)
+    return total_minutes
+
+
+def find_time_ranges(timesheet_line: str) -> Union[list, List[str]]:
+    remove_hashes_and_leading_trailing_spaces = timesheet_line.replace("#", "").strip()
+    try:
+        parse_time(remove_hashes_and_leading_trailing_spaces)
+    except ValueError:
+        return []
+    else:
+        if ":" not in remove_hashes_and_leading_trailing_spaces:
+            return []
+        return remove_hashes_and_leading_trailing_spaces.split(", ")
+
+
+def parse_time(time_string: str) -> time:
+    return parser.parse(time_string).time()
+
+
+def split_time_range_string(time_range_string) -> Tuple[str]:
+    return time_range_string.split("-")